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Re: Confusion over classification of dinosaurs
On 30 Nov 1999, Berislav Krzic wrote:
> 1. World famous palaeontologist Robert T. Bakker recently discovered a
> new 'miniature' version of Tyrannosaurus
> Rex and named it Nannotyrannus, meaning 'little tyrant'. How does he
> and other palaeontologists know this is a
> completely new genus and species and NOT just a juvenile or
> 'half-grown' T. Rex?
In fact, it is now thought to be a juvenile _Tyrannosaurus_ (probably
> 2. Is the English dinosaur Baryonix Walkerii, with a head similar to
> the giant Suchomimus Tenerensis, just a
> Spinosaurid without a sail, or is it still classified as a
_Suchomimus_ and _Baryonyx_ are baryonychine spinosaurids.
> 3. Is Yangchuanosaurus the Chinese eqivalent of the North American
> Allosaurus or Ceratosaurus, I have conflicting
> information on this?
_Yangchuanosaurus_ is an allosauroid.
> 4. Were there any known sauropods that survived right up until the end
> of the cretaceous?
Yes. _Alamosaurus_, for one. Sauropods were more common in Gondwana than
in Laurasia during the Cretaceous, and I don't think there are any
Gondwanan late Maastrichtian deposits (correct me if I'm wrong).
> 5. In the last century, Edward Drinker Cope discovered a meat eating
> dinosaur which he named 'Laelaps'. It is now
> known as Dryptosaurus, the 'wounding reptile'. It has two fingers on
> each hand and looks for all the world like a
> member of the Tyrannosaurid family. So why isn't it classified as
It has three fingers and is a basal coelurosaur.
> 6. Why do there seem to have been no large ceratopsians on any other
> continent besides North America?
The continents were very broken up by the time that ceratopsids evolved.
They did not have a chance to spread to other continents. _Turanoceratops_
is a large ceratopsian (not a ceratopsid, though -- probably) from Asia.
This info and more at: http://dinosaur.umbc.edu/
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